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100

x+9=21

x=?

x=12

100

20=8x=2x

x=?

20=10x

20÷10=10x÷10

x=2

100

9x-3=15

x=?

9x=15+3

9x=18

9x÷9=18÷9

x=2

100

add 7 to x and the result is 15.

what is x?

x=8

200

x÷4=5

x=?

x=20

200

-x=6x=-5

x=?

5x=-5

5x÷5=-5÷5

x=-1

200

4=3+x1

x=?

 4-1=3x

 3÷3=3x÷3

 16=x

200

when 12 is added to a number, the sum is 19

what is that number/x

x=7

300

7x=56

x=?

x=8

300

3x+7=2x+12

x=?

x+7=12

x=12-7

x=5

300

10-5x=80

x=?

-5x=80-10

-5x=70

-5x÷-5=70÷-5

x=-14


300

subtract 4 from x to get 9

what is x?

x=13

400

x÷8=6

x=?

x=48

400

2x+6=x+11

x=?

x+6=11

x=11-6

x=5

400

-2-2x=-26

x=?

-2x=-26+2

-2x=-24

-2x÷-2x=-24÷-2

x=12

400

a number divided by 6 gives us 3

what is that number/x?

x=18

500

x+11=3

x=?

x=-8

500

9x+4-5x=16

x=?

4x+4=16

4x=16-4

4x=12

4x÷4=12÷4

x=3

500

-10x+2=122

x=?

-10x=122-2

-10x=120

-10x÷-10=120÷-10

x=-12

500

when 3 is added to a number, the result is -5

what is that number/x?

x=-8